Master the Technology of Today, for Free

OpenCS is Aalto University's open online platform offering free computer science courses for anyone, anywhere. Whether you're starting your journey in tech or expanding your skills, you'll find high-quality, university-level learning at your fingertips.

Study at your own pace, mostly with no strict deadlines. The courses are open for learning free of charge, and everyone worldwide can gain valuable, practical knowledge in topics ranging from web development to modern programming languages.

Since July 16, 2026, OpenCS courses can still be studied freely, but they no longer provide official Aalto credits for non-Aalto learners. Aalto students should always check SISU and MyCourses for the most up-to-date information on the courses.

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You're in good company

Join tens of thousands of learners from a range of organizations, including...
Satakunta University of Applied Sciences (SAMK) Raseko (Raisio Region Education) Seinäjoki University of Applied Sciences (SeAMK) Kesko University of Oulu Alma Media Centria University of Applied Sciences City of Helsinki Yle Turku University of Applied Sciences (Turku AMK) University of Jyväskylä Aalto University Satakunta University of Applied Sciences (SAMK) Raseko (Raisio Region Education) Seinäjoki University of Applied Sciences (SeAMK) Kesko University of Oulu Alma Media Centria University of Applied Sciences City of Helsinki Yle Turku University of Applied Sciences (Turku AMK) University of Jyväskylä Aalto University
Jedu (Vocational School) Metropolia University of Applied Sciences University of Lapland Helsinki schools University of Eastern Finland (UEF) Kajaani University of Applied Sciences (KAMK) LAB University of Applied Sciences Tampere schools Karelia University of Applied Sciences Uniarts Helsinki (University of the Arts Helsinki) Oulu University of Applied Sciences Jedu (Vocational School) Metropolia University of Applied Sciences University of Lapland Helsinki schools University of Eastern Finland (UEF) Kajaani University of Applied Sciences (KAMK) LAB University of Applied Sciences Tampere schools Karelia University of Applied Sciences Uniarts Helsinki (University of the Arts Helsinki) Oulu University of Applied Sciences Jedu (Vocational School) Metropolia University of Applied Sciences University of Lapland Helsinki schools University of Eastern Finland (UEF) Kajaani University of Applied Sciences (KAMK) LAB University of Applied Sciences Tampere schools Karelia University of Applied Sciences Uniarts Helsinki (University of the Arts Helsinki) Oulu University of Applied Sciences Jedu (Vocational School) Metropolia University of Applied Sciences University of Lapland Helsinki schools University of Eastern Finland (UEF) Kajaani University of Applied Sciences (KAMK) LAB University of Applied Sciences Tampere schools Karelia University of Applied Sciences Uniarts Helsinki (University of the Arts Helsinki) Oulu University of Applied Sciences
Lapland University of Applied Sciences Jamk University of Applied Sciences University of Helsinki Laurea University of Applied Sciences Omnia (Espoo education provider) ABB Lahti / EduLahti SSKKY (Satakunta Vocational Education) Nokia Hanken School of Economics Espoo schools Lapland University of Applied Sciences Jamk University of Applied Sciences University of Helsinki Laurea University of Applied Sciences Omnia (Espoo education provider) ABB Lahti / EduLahti SSKKY (Satakunta Vocational Education) Nokia Hanken School of Economics Espoo schools Lapland University of Applied Sciences Jamk University of Applied Sciences University of Helsinki Laurea University of Applied Sciences Omnia (Espoo education provider) ABB Lahti / EduLahti SSKKY (Satakunta Vocational Education) Nokia Hanken School of Economics Espoo schools Lapland University of Applied Sciences Jamk University of Applied Sciences University of Helsinki Laurea University of Applied Sciences Omnia (Espoo education provider) ABB Lahti / EduLahti SSKKY (Satakunta Vocational Education) Nokia Hanken School of Economics Espoo schools
Lappeenranta-Lahti University of Technology (LUT) Ekky (South Karelia Education) Häme University of Applied Sciences (HAMK) Visma Åbo Akademi University University of Turku South-Eastern Finland University of Applied Sciences (XAMK) Tuxera Tampere University Haaga-Helia University of Applied Sciences University of Vaasa Lappeenranta-Lahti University of Technology (LUT) Ekky (South Karelia Education) Häme University of Applied Sciences (HAMK) Visma Åbo Akademi University University of Turku South-Eastern Finland University of Applied Sciences (XAMK) Tuxera Tampere University Haaga-Helia University of Applied Sciences University of Vaasa Lappeenranta-Lahti University of Technology (LUT) Ekky (South Karelia Education) Häme University of Applied Sciences (HAMK) Visma Åbo Akademi University University of Turku South-Eastern Finland University of Applied Sciences (XAMK) Tuxera Tampere University Haaga-Helia University of Applied Sciences University of Vaasa Lappeenranta-Lahti University of Technology (LUT) Ekky (South Karelia Education) Häme University of Applied Sciences (HAMK) Visma Åbo Akademi University University of Turku South-Eastern Finland University of Applied Sciences (XAMK) Tuxera Tampere University Haaga-Helia University of Applied Sciences University of Vaasa

Quick stats (trust us... mostly)

Smarter choices > smarter phones.
36.4 k
active users

Learners who didn't just sign up — they showed up, solved something, and likely got smarter doing it.

438.2 k
midnight oil burned

Hours logged after midnight, when genius (and bugs) truly awaken.

15.9 m
syntax errors survived

Unexpected token, missing parenthesis, unclosed string literal... survivors of the war against the compiler.

999 k
brain cells saved by copy-paste

Thanks, Ctrl+C and Ctrl+V. Without you, countless neurons would have perished.

Courses

Choose from a variety of courses designed by instructors at Aalto University.
5cr / EN
Introduction to Programming

Master the basics of programming with Python, and learn how to work effectively with generative AI tools in programming.

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5cr / EN
Databases

Data runs the digital world. Learn databases, SQL, schema design, and how data powers real applications.

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5cr / EN
Web Software Development

Learn how to create web applications with Svelte and Deno. This course covers both client- and server-side development, with a focus on practical skills. These materials are available until the end of 2026.

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5cr / EN
Modern and Emerging Programming Languages

Create your own programming language, learning Rust on the side.

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1cr / EN
Introduction to Large Language Models

Learn what language models are, how they work, and how to use them efficiently. At the same time, also reflect on the societal impacts of these models.

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2cr / EN
Software Engineering with Large Language Models

Learn how to use large language models in software engineering work and how to build small LLM-powered applications.

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